diff --git a/library/core/src/macros/mod.rs b/library/core/src/macros/mod.rs
index 41ea2760ec5..9a54921f07b 100644
--- a/library/core/src/macros/mod.rs
+++ b/library/core/src/macros/mod.rs
@@ -1,4 +1,4 @@
-#[doc(include = "panic.md")]
+#[doc = include_str!("panic.md")]
 #[macro_export]
 #[rustc_builtin_macro = "core_panic"]
 #[allow_internal_unstable(edition_panic)]
diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index 588bffb57c9..32aca8c8392 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -264,7 +264,6 @@
 #![feature(exhaustive_patterns)]
 #![feature(extend_one)]
 #![feature(extended_key_value_attributes)]
-#![feature(external_doc)]
 #![feature(fn_traits)]
 #![feature(format_args_nl)]
 #![feature(gen_future)]
diff --git a/library/std/src/macros.rs b/library/std/src/macros.rs
index c0750f8c0d1..b729349cf53 100644
--- a/library/std/src/macros.rs
+++ b/library/std/src/macros.rs
@@ -4,7 +4,7 @@
 //! library. Each macro is available for use when linking against the standard
 //! library.
 
-#[doc(include = "../../core/src/macros/panic.md")]
+#[doc = include_str!("../../core/src/macros/panic.md")]
 #[macro_export]
 #[rustc_builtin_macro = "std_panic"]
 #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/library/std/src/os/raw/mod.rs b/library/std/src/os/raw/mod.rs
index 22c98d7ade9..50464a050c7 100644
--- a/library/std/src/os/raw/mod.rs
+++ b/library/std/src/os/raw/mod.rs
@@ -18,7 +18,7 @@ macro_rules! type_alias_no_nz {
       $Docfile:tt, $Alias:ident = $Real:ty;
       $( $Cfg:tt )*
     } => {
-        #[doc(include = $Docfile)]
+        #[doc = include_str!($Docfile)]
         $( $Cfg )*
         #[stable(feature = "raw_os", since = "1.1.0")]
         pub type $Alias = $Real;